Simple template substitution of plain text and python3

SimpleTemplate.py

#!/usr/bin/python3

from string import Template

# open the file
filein = open('SimpleTemplate.tpl')
# read it
src = Template(filein.read())
# document data
hello_to = "Henry"
my_name = "Hubbert"
d = {'hello_to' : hello_to, 'my_name' : my_name}
# do the substitution
result = src.substitute(d)
print(result)

SimpleTemplate.tpl

Hello $hello_to,

what's up with you?

King regards $my_name